He's the #1 prospect in the #1 farm system. Do I really need to say more? Longoria looks to be a .300/30/100 player when he matures. Note: that would put him in hall of fame territory, if he stays healthy. He's really that good. He's not fast, but he has great footwork, hands and good arm strength, and therefore should be above average defensively.

Basically, if you were going to start your team around a young third baseman, I'd pick him before any of the guys above--including Ryan Braun (who's no longer a 3b, anyway).

Stewart's become the forgotten man, he's been the top 3b prospect for so long. Unfortunately, he struggled a bit in AA, but seemed to recover nicely in AAA last year. He's ready for the majors, but with Garrett Atkins ahead of him, one of them will have to be traded, or Stewart's going to have to settle in at second.

Sorry Giants fans, he won't help out for a while. That said, he was impressive as a 16yo in rookie league. He may end up as a first baseman, though, as he fills out. He hit .285 w/ a .450 slugging percentage. Did I mention he was 16? And by the way, he was 16.